Sound-reproducing instrument



July 21 1925.

. 1,546,795. J. ca. REDFORD SOUND REPRODUCING INSTRUMENT l lgd Feb. 14, 1920 /6104 a fifi/ l f! WITNESSES. I

ATTORNEY ill Lil

Patented July El, 1925.

u nrr stares JOHN G. EEDIEQBD, O1? lldILhVitlTKl-E, 'WISCONSIN.

SOUND-REPRODUOING IIlhlSEli-UIVXENT.

Application filed February 14, 1.8 20. Se ial No. 358,775.

To all 107mm it may concern:

Be it known that li, JOHN G, llnnrono, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and. f tate of l V isconsin, have invented new I and useful Improvements in Sound-Reproducing Instruments, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

The invention relates to sound reproducing instruments.

is generally constructed the motor or actuating mechanism of a talking machine is placed close to the amplifier so that sounds produced by the operation of the motor come in contact with the outer wall of the :lnifllfifil and both restrict and confuse the normal and desired function of the amplifier, resulting in a pronounced interference with. the musical effect of a record. Also the vibrations of the motor produce sound waves interfering with the reproducer. To overcome these difliculties l have provided a casing fitting closely about the motor and between the top of the cabinet and the amplifier and provided with a sound deadening lining which also covers the top of this casing. Such a construction sufficiently in sulates the motor and prevents sounds pro duced by the motors operation from being heard direct, or interfering with the proper action of the amplifier and reproducer.

It further object of the invention is to so shape the motor enclosing housing as to prevent its walls acting as a soundboard. The invention further consists in the sev eral features hereinafter set forth and more particularly defined by claims at the con clusion hereof.

In the drawings: Fig. 1 is a vertical sectional View through sound reproducing apparatus embodying the invention; Fig. 2 is a detail bottom view of the motor housing parts being broken away and parts being shown in section; Fig. 3 is an end View of the motor housing.

In the drawings the cabinet has a body portion 1 and a removable cover 2. WVithin the body portion is a top 3 having an aper ture therein with flanged seats to receive a removable top portion 4- carrying the usual motor or actuating mechanism 5 on its lower side connected to rotate the usual turntable 6 located within the top of the cabinet formed by the cover 2 and the top 3, 4t;

tone arm 7 carries and communicates with a 'eproducer 6 at one end and with a horn or amplifier 7 at its other end. This a p iiier is disposed within the body portics of the cabinet and is gene ally made of wood and while vibrations are set up in it by the sound from the roproducer, the motor mechanism also produces vibrations which interfere with these sound vibrations of the amplifier and also of the reproducer.

To prevent vibrations from the motor mechanism affecting the purity and clearness of the desired sound vibrations from the reproducer and the amplifier, I provide a hou g or casing 8 closely fitting around the motor mechanism and having upper flanged edges 9. This housing is provided with a lining 8 of sound deadening material, such as canton flannel. l have shown two layers of this material secured to the walls the housing and said flannel is placed with. the fleece or nap side facing out. @n the bottom of the top portion l I provide cover 10 of soluble sound deadening material, the outer edges of which are interposed. between the portion d and the flanged edg s 9 to form a soundproof joint between the housing an the top. The housing 8 is secured to the top by screws 11 or other suitable fastening means. 'llhe bot tom and end walls of the Lansing are preferably formed in a continuously curved surface so as to prevent the walls of the hous in: acting as a sounding board to give off objectionable vibrations received from the actuating mechanism.

l v here the winding shaft 12 and the speed control rod 13 pass through openings in the housing 8 l provide washers 14: of sound deadening material, such as canton flannel or felt having portions closely fitting these members to prevent the motor sounds passing out into the cabinet. These washers may also be formed by extending portions of the sound deadening lining 8 beyond the edges of the opening in the housing.

From the foregoing description it will be noted that the means for deadening the sound of the actuating mechanism prevents interference of the vibrations from said mechanism with the proper functioning of the amplifier and reproducer.

I desire it to be understood that this i11- vention is not limited to any specific form or arrangement of parts except in so far as such limitations are specified in the claim.

hat I claim as my invention is:

A mui'tler for sound-reproducing machines of the type having a cabinet and actuating mechanism carried on. the bottom of the top of the cabinet, comprising a housing enclos ing said actuating mechanism and having flanged edges and a curved surface forming its bottom and opposite end Walls, sound deadening material lining the walls of said 10 housing and covering its top and the flanged ture.

JOHN G. REDFOR-D. 

